I will build and integrate secure apis for your application

O
olawale_gasali
O
olawale_gasali
Olawale Gasali
build and integrate secure apis for your application
Full Screen
build and integrate secure apis for your application
Full Screen
build and integrate secure apis for your applicationbuild and integrate secure apis for your application

About this gig

Need a reliable backend or API to power your web or mobile application?

I will design and develop a secure, scalable, and well-structured backend tailored to your application's requirements. Whether you need a new API built from scratch, a backend for an existing frontend, or improvements to an existing system, I can help.


I CAN BUILD:

  • REST APIs and backend services
  • User authentication and authorization
  • Role-based access control
  • Database design and integration
  • CRUD operations and business logic
  • Third-party API integrations
  • Payment gateway integrations
  • File upload and management
  • Admin and user management APIs
  • Data validation and error handling
  • API documentation
  • Backend integrations for web and mobile apps


My focus is on clean architecture, secure implementation, reliable API design, maintainable code, and performance.

I can work with your existing frontend, design, database, API documentation, or project requirements and build the backend around them.


Have a backend project or API idea?

Send me your requirements before placing an order so we can discuss the scope and find the right solution for your project.

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Performance
    • Security
    • Databases

  • Programming language

    • TypeScript

  • Frontend framework

    • jQuery
    • Next.js
    • React.js
    • Svelte
    • Vue.js

  • Backend framework

    • Express.js
    • FastAPI
    • Fastify
    • NestJS
    • Node.js

Get to know Olawale Gasali

Olawale Gasali

Full Stack Developer, SaaS and Web Application

  • FromNigeria
  • Member sinceAug 2026
  • Avg. response time1 hour

  • Languages

    English, Arabic, French, German
I’m a full stack developer focused on building reliable web applications, SaaS products, APIs, and business automations. I work with modern technologies including React, Next.js, TypeScript, Node.js, Express, Python, Django, PostgreSQL, Redis, Docker, and REST APIs. I care about clean architecture, responsive interfaces, reliable backend systems, and delivering solutions that are practical and easy to maintain. Whether you need a SaaS application, custom web application, backend API, database integration, or workflow automation, I can help turn your requirements into a working solution.

My Portfolio

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